<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width: 100px;
            height: 100px;


            /* 边框的写法:
                  边框必须要指明线型  和 线的宽度    颜色可以省略(默认为黑色)*/


            /*border: 10px  solid  red;*/

            border-top: 10px  solid  red;
            border-bottom: 1px  solid  red;
            border-left: 10px  solid  red;
            border-right: 2px  solid  red;
        }
    </style>
</head>
<body>

    <hr>
    <div>
        div
    </div>
    <hr>


</body>
</html>
